Company car or private: the question to settle first

Before any amount matters, three questions come first, and none of them is about tax. Who buys the car and appears as its keeper in the documents? Who actually drives it, and how much of that is private? And who is liable if something happens on a private journey? The answers to those three then determine everything else, tax treatment included.

The reason for that order is practical. Tax rules can be looked up and they change; the allocation of a car to a person or a business does not change easily, and a contract signed on the wrong side cannot be reinterpreted afterwards. Calculating first and only then deciding who should own the car means calculating with figures that have no basis yet.

This piece describes how the calculation is built and which inputs move it. It names no rates and no flat figures: those change with every amendment, and the binding answer comes from the competent authority — in Germany the tax office, in Switzerland the cantonal tax administration, and for employees additionally the employer who runs the payroll.

The same question hides three very different starting positions, and the answers have little in common. Confusing them means taking advice that was meant for somebody else.

In the first case an employer provides a car that it leases or buys itself. Here the driver decides not about the car but about the terms of its use — and the question is not whether to buy but how private use is settled and what is left after tax.

In the second case someone runs their own business or is self-employed and decides whether the car goes into business assets or is bought privately and used partly for work. That is the constellation with the most room to arrange things and the most room to get them wrong. In the third the car is private and occasionally used for work — then it is not about allocation but about documenting those journeys properly.

Every system here turns on the same point. Costs incurred for business reduce profit and so reduce tax. A car used exclusively for business is therefore unproblematic. As soon as it is also used privately, part of those costs stops being a business expense and becomes a benefit to a private individual — and that gets recorded and taxed.

For employees this benefit is called a non-cash benefit in Germany and payment in kind in Switzerland; the effect is the same. It is added to taxable income, appears on the payslip and, in both countries, feeds into social security contributions as well. So a company car is never free to the person receiving it — it is pay in another shape.

For the self-employed and business owners the same logic runs the other way round: there the private share is taken back out of the vehicle costs already booked. The result is comparable, the route is not — which is exactly why figures from one case do not carry over to the other.

At their core both countries offer the same choice. Either private use is assessed at a flat rate — tied to a vehicle value and independent of how much was actually driven privately — or it is evidenced, by recording every journey and working out the actual share of the costs. The rules differ in detail; the structure of the decision does not.

From which it follows which inputs move the decision, and there are only two. The first is the value of the car the flat rate hangs on: the more expensive the car, the higher the assumed benefit, regardless of use. The second is the share of private kilometres in total distance: the smaller it is, the worse the flat rate looks against the evidenced method.

The rule of thumb that emerges is robust against changes in the rates: an expensive car with little private use argues for the evidenced method, a cheap car with a lot of private use for the flat rate. In between, the deciding factor is effort — and with the evidenced method that is considerable.

The evidenced route stands or falls on a complete record. It has to be kept contemporaneously, run continuously, and contain the same details for every journey: date, odometer reading at start and end, destination, purpose and, for business trips, the business contact visited. Private journeys are noted as such, with distance but without a purpose.

Almost every challenge comes back to the same mistake: the record was created after the fact. A log written at the end of the year in one sitting shows in the evenness of the handwriting, in missing intermediate readings or in jumps in the odometer — and then the whole record fails, not the single journey but the method for the entire year.

Electronic systems take that work off you and produce a record that meets the requirements, provided it cannot be altered afterwards. They cost money and raise a data-protection question where an employer can read along. Choosing the evidenced route means choosing a year of discipline — switching method part-way through the year is generally not possible.

The structure is similar in both countries; the competent authority and the basis of assessment are not. In Germany the tax office is competent, and the flat benefit is measured against the car's list price at first registration, including options. So someone driving a used car is assessed on a value nobody paid — a point that weighs heavily on older cars.

In Switzerland federal, cantonal and municipal levels come together, the declaration runs through the salary certificate, and the flat private share is measured against the car's acquisition value. The treatment of the commute is regulated differently from Germany, and it has been adjusted several times in recent years. Which version applies is a question for the cantonal tax administration.

For the cross-border case — living here, employed there — neither route applies on its own. There taxation and social security depend on double taxation treaties and coordination rules, and a customs question arises on top: a company car registered abroad may not simply be used privately in the country of residence. That constellation belongs settled before the first kilometre, not after it.

The tax calculation is rarely the only reason, and at these sums it is often not even the most important one. Four points apply regardless, and three of them are regularly overlooked.

The first is insurance. The keeper and the driver need not be the same person, but the policy has to know who drives and why. A car registered to a business and regularly driven privately and by family members needs cover that reflects that. The second is dependency: a company car ends with the employment, and anyone used to one is left without a car when they change jobs — with a need that wants financing immediately.

The third is the contract itself. A lease taken out by the business binds the business, not the person, and it runs on even when the driver leaves. The fourth is the reverse of the whole idea: taking an allowance for using your own car instead of a company one keeps you free to choose the car and how long to keep it — and leaves the value risk with you. Which fits better depends on the planned mileage and on how much you want to choose the car yourself.

Even without knowing a single rate, the structure of the decision can be worked through. Put two variants side by side and fill in the same lines in both: purchase or lease payment, insurance, tax, fuel, servicing, tyres, depreciation. Up to that point it is the ordinary cost calculation for a car.

Then comes the one line that makes the difference: the tax effect. In the company variant that is the additional taxed benefit, or the private share taken back out; in the private variant it is the deduction for kilometres driven for work, so far as one is available. The figures for that line come from the official source or from payroll — this piece deliberately does not supply them.

The most useful part comes last and is almost always skipped: sensitivity. Run the same table twice more, once with considerably more and once with considerably fewer private kilometres. If the answer flips, you know the decision rests on an assumption rather than a fact — and that it wants revisiting as soon as driving habits change.

The points below can be settled in one conversation — with the employer, with a tax adviser, and where binding figures are involved, with the competent authority. They are not tax advice but the list of what you need to know in order to take some.

However the allocation turns out: at the start there is a car with a price, and that price feeds into every variant. Under the flat assessment the benefit hangs on a vehicle value; under the evidenced method the total costs hang on the purchase and on depreciation. A car bought more cheaply is the cheaper one under either variant.

So comparing prices across the European markets pays even where the car ends up registered to a business. Same model, same year, comparable mileage — the differences between markets are the same for company cars as for private ones.

Carvexia shows listings and prices and is a party to no purchase, lease or employment contract. This piece describes how the calculation is built; the binding figures and their application to your case come from the competent tax authority, your employer or a tax adviser.